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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b384064fc798475a07e6b5587a61551e474d4503f88a5ca5d55dd7fd660e04ec' 
  AND token = 'W9ixNT96+xiTuTTL++qX3+/2UxIe50Um90leOiIxLKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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