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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574bb870d7720e056605f00b2f78ac7a76343d0b6ca0a7b3d9cd970b0c70bc3a' 
  AND token = 'BU5RVSr0q5cLVYLpC26HyK69nYMK+USukW2jtUlCsH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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