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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf4296ecec933d2e959f1644ed7c9fd0978172ebf1246bb99ed9ec0a8d60233' 
  AND token = 's/JR5iM++yIIqTHkXpVcN3Wx9HxQLhLLs1MpEibabtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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