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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e86cb29766fb9ca97b3672d42ccd1ce68907acf8b0473b6891511386d8040c' 
  AND token = 'd0lvhhCSW5hDG9wsAvKcjUcIw25ZbYkcR3f8bW+moGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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