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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd570a0f29237cacf7cf7717a86aaddddd58f856f222eca2e251231d7656ec736' 
  AND token = 'vL3pWURq1KWNlbWoS57n3DxlvqD9D/ai9FTpWJzR5HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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