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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e178530569ec8f1f50c21f1bdbe722b9c45b40d6b5289e173e16167a3592a6ce' 
  AND token = 'BreoXjjko+N06if06zNOV0fx+1XCLyMe0iLrWJuieDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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