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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c9aea674950dd8ca3d495a03be76e453e03597f576ae2b9840c75ef3557d8c' 
  AND token = 'rn2WAjuoq987nSCGrVRoxC2ePOoxPLCqJCpCg5rg6hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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