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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e09e4e3f62d7c97b016c59623a461ce7f3fa745c08b96f841eaee1af568f2c' 
  AND token = 'wzNKKsbXHHnSdh01HO4Er8iPxT3XNHfZYKRQ6g00/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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