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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c2bf42a759c4605c866d3a543a4c92a20b440a69595a88cd2305d03a9a3626' 
  AND token = '7qW6feF5VJvGmUcKb1D44d7zRbRvdsc5QAORCEqp6Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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