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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e39bd5e4051fb0ac6c2a38383f443d7a3e7b50a9a7ead87acac0fcd82d71e9e' 
  AND token = 'A8Ey39bXC3gl4GHhVd6j4R2tTCcrWsgfe7Z+QEA7LB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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