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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9a3c3333940eb104735a1ea1e27a773cb6e71a38f308e785bcd5e01bbfda86' 
  AND token = 'ajVRPTQfMsId+feIKT+vnq4hTNh+EA2YcUCwib7nhnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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