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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c339163550ccf2faeacbd2da8961c72da50dc30874f559938f37e0c47b5c2a8' 
  AND token = 'peVfoPsfiJ0NG7RNkBRY3j50Fh0TLxKyBTXIkgkL+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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