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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f482cd67b1decf5f7ffbbe978053e218fbb3ef49236c4d5fcabdb8e8bdd6a34b' 
  AND token = 'x/tXNobMCnj05vx9gg8ZWJCO+W4EafTTaiWDVvpgweY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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