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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572dd071d62ce2494d0b56dca25c68e06f13a8f0a2998f74d2457661482d45b8' 
  AND token = 'txk3+IvhxLwW0bmJRw1Tlx0Q5OjccNBAKsQL1yfcFSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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