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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b47459b92fee3945ecbbbe2f0e48bf37979a7f2cfa4f13f87139ecb5a8869c' 
  AND token = 'f8B84m8w06r5z57BnntYq2BlBK7xt9qvvYrJm4CaLNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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