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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1b577440cc685ed3ceb4b009e24f06a1725d5952efe80c24734930a4eea1d1' 
  AND token = '5RCKloKY1oZ3muxptZOsWRGdVWHM349iVBRbhRkku3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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