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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9676ec798e10ee408cc82bda9a588d033d99444d829511b6aee195080e9bad58' 
  AND token = 'WVfbXkFj9FA4tLloM3/sVoC85DJhAGS2gBgsetkKhZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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