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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f22e8965edda48916cdc1c1e9a1c7409e82940502249e56b63ec53571d6d1fb' 
  AND token = 'TJYNuf2/R5Ei+Irs4f/J11wFkB/4u7chMqIIuj1byU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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