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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc826eecd65a5551347682b244d984feda8032a891e617f665c58fbbd40f241' 
  AND token = 'N4U9mf/ULDZUmtci7SkcQakKcBbNMfIQ3t5wgq8ogbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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