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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb307c6482262d3e651d4f70368e9121dcb41c3f7e12bca3b11add063630b6f2' 
  AND token = 'wQqBmFW74gInnVL1VLb/CxBIcmoAJRexD5Phf8Qpf5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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