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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b830f3d64a41849d8dd58fc388953c6e9feb957e4cb76745aeb29ed55c60c9' 
  AND token = '4CFKHsZnQHeFmuDVymxvHo4i3x1GoCRTahZoAZjpHRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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