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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c7f4a3f7224ae2c9df266fb48ea68c6763842a6db5c5b9d5c0c70cbf265242' 
  AND token = 'Ad6343Pyx7gQizAfzSwmuU6LSMDTJep+vC3TAXhPVNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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