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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f513101a97f405de1d3652e03f35c56a5584ec0bacd80423fb3db58fc4905c' 
  AND token = '9IzShEkcoQeuWYYqr/3OOpMXLatyOomm1cMDVkIpxCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00178

JSON explain

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