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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c679285a61cb60cce5b23187930da0b891ef9295f8785770d577d6d3f88e8965' 
  AND token = 'DK93hvYIPJRER+Tm18PxRBWET2LSVuL2bCUYmbjZPAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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