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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fef38ac61c97b5ef2e1720426d2955754c2b606dc0d646437e76106878782ed' 
  AND token = 'woxAMomvW+UqzJ22V5zwwiFEP3/InE7RhXs3eSZciXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}