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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9b726d13f8e60d632ada204bea1984c9b7ed0de56a495831bdf4f074a45007' 
  AND token = 'UcYAHjGuCahnppTfbGr4UQufvp3NdgAaieGyPGvjNEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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