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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5026e8f1b745ae9da40423863678b64d0c5763b9bf529c7976327fe4c074af' 
  AND token = 'aeuuzPRsExC49s2tq/pdxXejB6Q0sjH/jecqPju4CZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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