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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b38ec0f91ca8d8ff442d2fda6d3cd9bd09d208af83fc87f1e17bbec8d6802e2' 
  AND token = '5v1bxkCDejOU116MfWW+wx5g+qZvpoWhxETj/omsd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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