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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1287b8c784fe1fb1fc315434e6a0cd9760f0ad92c3f604093b7604cd421f6371' 
  AND token = 'uNGcrEAfewlRz0+2CozEHI5GaMS6UaWCav2z+ODyWFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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