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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62bccdf522b112829f53e7ee7295a2b4c6233a841e17b6c0e6c4b2fa99f7044' 
  AND token = 'kqfunyo6JxZA1j67NnnzF2dtMU7DwBe3xZEnO4bE0UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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