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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61ac904ce92072c35a17c145ce22e5a0578775cd0f148dac1057d99c0e59fdb' 
  AND token = 'sJjW8GUeUSzD0TLGyN0+FpBTdW2u0YZDXq1F54UGOK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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