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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbde268713220b22f7c786f3bcac57e64d44de8dde33ba6b9b10795673eba4c6' 
  AND token = 'ObW3IPImSZ3CB0mpN4a43bp3j5wWF3ReL8s4fW/ogeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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