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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b5697661c09052004b32e98df130c96860ece9b21a3d2ec4b833bee1611f22' 
  AND token = '8BPFTS9VdU+grQzkUHABMj0lbJ1vRJZcfXBJX6EW8Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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