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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1717bc1ca55824085e7b25e6c8845a5f514e7b4310c3b4a674414c5ae5bd4741' 
  AND token = '/AYd0n7rfO4p7wVLVOI8WaBFuHbK8D571++dMUimzpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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