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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159eec97a0088d06b4023a5bf5ce86234c4bc6e417146def4fede1002795798a' 
  AND token = 'ggSoh2KZukCdisPwHYNH0wjbW2NWQa4noQIqiuzJPmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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