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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629f00a14a4741b0e652255c4a88d15d20b7fbe1e3090c37e7c6679dad514a50' 
  AND token = 'k2imb2anrMv9p+Knw4gSJKG2hjRLtbVao9U1fjLnqU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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