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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f4cf5d33cae96d0e1282b46d606dc678d9c27b9fde07634a88b2b0d04f5eff' 
  AND token = 'DjyfwkS+q6+qdCTh78Scrl+QwvNHZLnofTDv8a3QBZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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