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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b87e93fd188631e566df80f5affec6e292d1743f7c22c446fca528620b2c37' 
  AND token = '7rRyxycl+TS2kzh/bS16Lrhmu7+YNCNCImXq5zGTwP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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