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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b0b747c1537ceac0877dd73ddd09a5fd40b3a7b31852d69c3aca142d59e234' 
  AND token = 'TCj+bzaJZuGkZlOU87EIip2uYq6SJaQYdfK4uaNWgk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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