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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7ab50613b547fb225d9fb882f77a13aabcc43e0727f7bb3d1718a9fd769ca0' 
  AND token = 's9ZbEOhxzYuZtsRj4H6FFKfL1slVeGddVUkrlpZndjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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