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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b069d2d252e84c247a907355d8ee00092d04cceb5a9037ed9a1c315e9086ae9' 
  AND token = 'V34ytQ7xq+G5WWB0I9DWSfqLN50m52aCCP59bpkKLvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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