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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec58265c7cce55b9a3c94ff7adc09a4b8e3d4d020536e3986bfc6c920c640407' 
  AND token = '58g3mV1JBiSPXgUHeyxLuifMfe6/tKx4J1DBaxDFa78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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