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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fc1b0b0bf637204aab8f658482c9c2c36f5bf9c1b8bd6884e258e0fb379fae' 
  AND token = 'bor0lGPmp5W6QeBLy2FdCHzwYsnnEZ63U+GLio9du7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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