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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe84c1f61adf088aeb638d45f0d09ffde7f3a9efcc64f69f481f004af5f9895' 
  AND token = 'YKux1qZUNECbl4aBa5sWusR7gg0Ky/Ec2LxSj+QsdY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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