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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd846c064fd5af130c4539860123ceb776f31f0aa0fb557d24a4b2466a425a91' 
  AND token = 'xANAuOcCGdmnvFXC6+ti9cDeToeudpBJKnmOIAwzkR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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