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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0d730803025dc02ecbe7101735434e7fb9ca53c6b68c9c032058bcbef59a6c' 
  AND token = 'b5CuAtB12QAopUfvLl4LNUwD8y8k8L9ka491vdGzhgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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